OPTICAL INFORMATION RECORDING MEDIUM AND METHOD FOR PRODUCING SAME

摘要

THE PRESENT INVENTION IS RELATIVE TO AN OPTICAL INFORMATION RECORDING MEDIUM (1) HAVING A REFLECTIVE LAYER FOR READING OUT INFORMATION SIGNALS BY AN OPTICAL TECHNIQUE. THE OPTICAL INFORMATION RECORDING MEDIUM (1) IS FORMED AS A PLASTIC SUBSTRATE (2). ACCORDING TO THE PRESENT INVENTION, THE SUBSTRATE IS COLORED BY ADMIXTURE OF A DYESTUFF FOR ENABLING INSTANT JUDGMENT BY THE VISUAL SENSE OF THE OPERATOR AS TO THE CONTENTS OF THE OPTICAL INFORMATION RECORDING MEDIUM (1), FOR EXAMPLE, AS TO IF THE CONTENTS OF THE RECORDING MEDIUM IS A GAME PROGRAM OR THE MUSIC INFORMATION. IF IMPURITIES SUCH AS DYESTUFFS ARE ADMIXED, THE OPTICAL SYSTEM OF THE READOUT DEVICE IS USUALLY AFFECTED THUS RAISING READOUT DIFFICULTIES. SUCH ILL EFFECTS ON THE OPTICAL SYSTEM MAY BE ELIMINATED BY SETTING THE PARTICLE SIZE OF THE DYESTUFF SO AS TO BE 50 µM OR LESS.